Was there Helan in Tang Dynasty?

Helan is pronounced Helen (ㄏㄜㄢㄢ). Their surnames come from two sources: 1, which comes from the surnames of Xianbei people in ancient north; ? 2. from the surname. In the Western Wei Dynasty, Minister Pei Wenju was named Helan, and in the Wuding period of the Eastern Wei Dynasty, Minister Su Chuo's younger brother Su Zhuang was named Helan. The Northern Zhou Dynasty was given the surname Helan by Liang Tai.

According to Guanju, Emperor Xiaowen of the Northern Wei Dynasty stipulated that the three surnames and four surnames of Xianbei Hu people were sinicized and changed to single surnames, such as Helan surname. All three surnames belong to Helan surname. Later, some restored their original surnames, and some simplified them to Helan, so today's Helan surname is a rare surname.